Opportunities for production and property research of neutron-rich nuclei around N=126 at HIAF  

作　　者：Shao-Bo Ma Li-Na Sheng Xue-Heng Zhang Shi-Tao Wang Kai-Long Wang Chun-Wang Ma Hool-Jin Ong Zhi-Yu Sun Shu-Wen Tang Yu-Hong Yu Xin-Tong Du Xiao-Bao Wei 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516000,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]College of Physics,Henan Normal University,Xinxiang 453007,China [5]Institute of Nuclear Science and Technology,Henan Academy of Science,Zhengzhou 450046,China [6]Joint-Department for Nuclear Physics,Lanzhou University and Institute of Modern Physics,Lanzhou 730000,China [7]Research Center for Nuclear Physics,Osaka University,Osaka 567-0047,Japan [8]RIKEN Nishina Center,Saitama 351-0198,Japan [9]Northwest Normal University,Lanzhou 730070,China

出　　处：《Nuclear Science and Techniques》2024年第6期101-113,共13页核技术（英文）

基　　金：supported by the High-Intensity heavy-ion Accelerator Facility (HIAF) project approved by the National Development and Reform Commission of China

摘　　要：The study of nuclide production and its properties in the N=126 neutron-rich region is prevalent in nuclear physics and astrophysics research.The upcoming High-energy FRagment Separator(HFRS)at the High-Intensity heavy-ion Accelerator Facility(HIAF),an in-flight separator at relativistic energies,is characterized by high beam intensity,large ion-optical acceptance,high magnetic rigidity,and high momentum resolution power.This provides an opportunity to study the production and properties of neutron-rich nuclei around N=126.In this paper,an experimental scheme is proposed to produce neutron-rich nuclei around N=126 and simultaneously measure their mass and lifetime based on the HFRS separator;the feasibility of this scheme is evaluated through simulations.The results show that under the high-resolution optical mode,many new neutron-rich nuclei approaching the r-process abundance peak around A=195 can be produced for the first time,and many nuclei with unknown masses and lifetimes can be produced with high statistics.Using the time-of-flight corrected by the measured dispersive position and energy loss information,the cocktails produced from 208 Pb fragmentation can be unambiguously identified.Moreover,the masses of some neutron-rich nuclei near N=126 can be measured with high precision using the time-of-flight magnetic rigidity technique.This indicates that the HIAF-HFRS facility has the potential for the production and property research of neutron-rich nuclei around N=126,which is of great significance for expanding the chart of nuclides,developing nuclear theories,and understanding the origin of heavy elements in the universe.

关 键 词：HFRS FRAGMENTATION Neutron-rich nuclei around N=126 Mass measurement LIFETIME 

分 类 号：O571[理学—粒子物理与原子核物理]